Template:Gilmour1941 table1: Difference between revisions
From Embryology
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|+ colspan=5| '''Stages of Erythropoiesis''' | |+ colspan=5| '''Stages of Erythropoiesis''' | ||
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! Stage of development | ! Stage of development | ||
! Within embryo or extra-embryonic tissues | ! Within embryo or extra-embryonic tissues | ||
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| Primitive | | Primitive | ||
| Megaloblastic | | Megaloblastic | ||
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| From establishment of circulation (about 2-5 mm.) to 9 mm. | | From establishment of circulation (about 2-5 mm.) to 9 mm. | ||
| In general circulation (of embryo, yolk sac and chorion) | | In general circulation (of embryo, yolk sac and chorion) | ||
| Line 25: | Line 25: | ||
| Partly primitive, partly definitive in general circulation; definitive elsewhere | | Partly primitive, partly definitive in general circulation; definitive elsewhere | ||
| Megaloblastic | | Megaloblastic | ||
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| 48 mm to between 15 and 21 days after birth | | 48 mm to between 15 and 21 days after birth | ||
| Intracorporea1 in many organs and tissues | | Intracorporea1 in many organs and tissues | ||
Revision as of 01:46, 17 May 2018
| Stage of development | Within embryo or extra-embryonic tissues | Within or outside vessels | Haemopoietic family | Type of erythropoiesls |
|---|---|---|---|---|
| Jones-Brewer presomite embryo till establishment of circulation (about 2.5 mm) | In blood islands in yolk sac, in some of cases in body stalk in the chorion or ' the embryo | Intravascular: possibly extravascular in body stalk in a few cases | Primitive | Megaloblastic |
| From establishment of circulation (about 2-5 mm.) to 9 mm. | In general circulation (of embryo, yolk sac and chorion) | Intravascular except for continued multiplication of cells in hemorrhages | Primitive | Megaloblastic |
| 10 mm. up to less than 48 mm. | In embryo, yolk sac and general circulation | Intra- and extra~vascular (marrow first in 57 mm. embryo) | Partly primitive, partly definitive in general circulation; definitive elsewhere | Megaloblastic |
| 48 mm to between 15 and 21 days after birth | Intracorporea1 in many organs and tissues | Extravascular, except sinuses of liver spleen and multiplication of cells in circulation (70 - 160 mm.) | Definitive | Partly megaloblastic, partly megalo-normoblastic (48-190 mm.); partly megaloblastic, partly normoblastic (190 mm. onwards) |
| 21 days or more after birth | Intracorporea1 in marrow only | Extravascular | Definitive | Normoblastic |
